Damn Mark!! Mark Zuckerberg has gone from his best week ever to the worst week ever in less than 72 hours. Read more

Three investors sued Facebook and chief executive Mark Zuckerberg on Wednesday, along with lead underwriter Morgan Stanley and a host of other underwriters, accusing them of withholding negative information about the social network’s initial public offering.

“It appears as though material information was not disclosed,” said Robert Weiser, one of the plaintiff lawyers in the class action suit. “We believe that the offering was conducted unfairly and it harmed public stockholders.”

The suit was filed in the U.S. District Court for the Southern District of New York in Manhattan.

According to a report published by Reuters, Morgan Stanley (MS, Fortune 500) shared a negative assessment of the social network with major clients ahead of Facebook’s (FB) IPO, which debuted last week.

The lawsuit states that “certain of the underwriter defendants” estimates for how Facebook would perform in the second quarter and for the full year.

The “revisions were material information which was not shared with all Facebook investors, but rather, was selectively disclosed by defendants to certain preferred investors and omitted from the registration statement and/or prospectus,” the plaintiffs claim.